Good morning Jillbugs,
Peritoneal mets aren't uncommon -- not quite as common as some other sites, but not terribly unusual. I am just wondering how they know about them if they are microscopic. I don't think it is routine to biopsy the peritoneum when doing a resection. So what surgery have you had so far?
I have a "suspected" peri met from CT scan, but they can't tell definitively. Even if it is there, surgery is off the table for me due to other mets. A bit of encouragement: you can see that I am 6.5 years out and still feeling pretty good most of the time. You asked about my surgeries; I've had a colon resection and LN dissection (it first came back for me in lymph nodes.)
Now, a word of advice: get copies of ALL lab, CT and surgical reports, as well as CDs of your scans and keep them in a binder. There is no one who will pay as much attention to your case as you. Even the most caring of docs is pressed for time. (Perhaps you have already done this, but I found out the hard way that the oncs don't pay so much attention -- it isn't him/her whose life is on the line.)
Also, use this forum a lot. There are the most unbelievably knowledgable and caring people here. If you haven't had surgery yet, you'll want to search the forum for "cimetidine". Don't be shy about asking lots of questions. Also, be sure an make the subject something like "Question about peri mets", you'll probably get more replies. In fact, you might want to go back and edit your original post. Old-timers will often skip a topic unless they know there is a question inside...